The four subcontractor unions at public institutions that won Korea's first-ever recognition of principal employer status under the revised Trade Union Act — commonly known as the "Yellow Envelope Act" — argued that their parent organizations had effectively determined wages and exercised personnel authority, an analysis of their filings shows.
Many observers had expected workplace safety management and supervision of duties to be the central issues. In practice, however, the unions built their cases primarily around the parent organizations' direct involvement in wages and personnel decisions. Because these arguments appear to have heavily influenced the rulings, legal experts say they could serve as key criteria in future Labor Relations Commission cases.
